एपीए उद्धरण

Observatory, A. Miscellaneous scientific papers of the Allegheny Observatory. Pittsburgh, Pa.

शिकागो स्टाइल उद्धरण

Observatory, Allegheny. Miscellaneous Scientific Papers of the Allegheny Observatory. Pittsburgh, Pa.

एमएलए उद्धरण

Observatory, Allegheny. Miscellaneous Scientific Papers of the Allegheny Observatory. Pittsburgh, Pa.